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These are replies submitted by schweden76

@ EugeneKalentev 75

for the Mises-Stress, OK.

What about the calculation for "r"?


The yield/failure surfaces used with this model are written in terms of the three stress invariants: the equivalent pressure stress,

the Mises equivalent stress,

and the third invariant of deviatoric stress,

where is the stress deviator, defined as

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